Display device and electronic device

ABSTRACT

The present disclosure provides a display device and an electronic device. The display device includes a substrate, a pixel circuitry, a first light emitting unit, a fingerprint sensor circuitry, and a fingerprint sensor unit. The pixel circuitry and the first light emitting unit are disposed on the substrate, and the first light emitting unit is driven by the pixel circuitry. The fingerprint sensor circuitry and the fingerprint sensor unit are disposed on the substrate, and the fingerprint sensor unit is driven by the fingerprint sensor circuitry. The first light emitting unit overlaps with at least a portion of the fingerprint sensor circuitry in a top view direction of the display device.

CROSS REFERENCE TO RELATED APPLICATION

This application claims priority of China Application No.201910723185.1, filed on Aug. 6, 2019. The entirety of theabove-mentioned patent application is incorporated by reference hereinand made a part of this specification.

BACKGROUND OF THE DISCLOSURE 1. Field of the Disclosure

The present disclosure is related to a display device and an electronicdevice including sensors, and more particularly, to a display device andan electronic device including fingerprint sensors.

2. Description of the Prior Art

In general, fingerprint identification can be used to identify personalidentity. Fingerprint identification has been integrated into electronicdevices and widely used with the development of the technology ofelectronic device. Users can directly access the electronic devicethrough the fingerprint identification without memorizing passwords.Moreover, fingerprint identification can provide better convenience orsecurity since the process of fingerprint identification is fast and thefingerprint is difficult to counterfeit. In recent years, the industryis committed to integrating the fingerprint sensing function and thedisplay function into the electronic device that can displayhigh-resolution images. The sensing technology can not only be appliedto fingerprint identification, but also has applications such as imagesensing or touch sensing.

SUMMARY OF THE DISCLOSURE

To solve the above technical problem, one of the objectives of thepresent disclosure is to provide a display device including a substrate,a pixel circuitry, a first light emitting unit, a fingerprint sensorcircuitry, and a fingerprint sensor unit. The pixel circuitry and thefirst light emitting unit are disposed on the substrate, and the firstlight emitting unit is driven by the pixel circuitry. The fingerprintsensor circuitry and the fingerprint sensor unit are disposed on thesubstrate, and the fingerprint sensor unit is driven by the fingerprintsensor circuitry. The first light emitting unit overlaps with at least aportion of the fingerprint sensor circuitry in a top view direction ofthe display device.

The present disclosure also provides an electronic device including adisplay device. The display device includes a substrate, a first pixelcircuitry, a first light emitting unit, a sensor circuitry, and a sensorunit. The first pixel circuitry and the first light emitting unit aredisposed on the substrate, and the first light emitting unit is drivenby the first pixel circuitry. The sensor circuitry and the sensor unitare disposed on the substrate, and the sensor unit is driven by thesensor circuitry. The first light emitting unit overlaps with at least aportion of the sensor circuitry in a top view direction of the displaydevice.

These and other objectives of the present disclosure will no doubtbecome obvious to those of ordinary skill in the art after reading thefollowing detailed description of the embodiment that is illustrated inthe various figures and drawings.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a schematic diagram illustrating a display device according toa first embodiment of the present disclosure.

FIG. 2 is a circuit diagram of the display device in FIG. 1.

FIG. 3 is a cross-sectional schematic diagram illustrating a structuretaken along the line A-A′ of FIG. 1.

FIG. 4 is a schematic diagram illustrating a display device according toa second embodiment of the present disclosure.

FIG. 5 is a schematic diagram illustrating a display device according toa third embodiment of the present disclosure.

FIG. 6 is a schematic diagram illustrating a display device according toa fourth embodiment of the present disclosure.

FIG. 7 is a schematic diagram illustrating a display device according toa fifth embodiment of the present disclosure.

FIG. 8 is a schematic diagram illustrating a display device according toa sixth embodiment of the present disclosure.

FIG. 9 is a cross-sectional schematic diagram illustrating a structuretaken along the line B-B′ of FIG. 8.

FIG. 10 is a schematic diagram illustrating a display device accordingto a seventh embodiment of the present disclosure.

FIG. 11 is a schematic diagram illustrating a display device accordingto an eighth embodiment of the present disclosure.

FIG. 12 is a schematic diagram illustrating a display device accordingto a ninth embodiment of the present disclosure.

DETAILED DESCRIPTION

The present disclosure may be understood by reference to the followingdetailed description, taken in conjunction with the drawings asdescribed below. It is noted that, for purposes of illustrative clarityand being easily understood by the readers, various drawings of thisdisclosure show a portion of an electronic device or a tiled device, andcertain elements in various drawings may not be drawn to scale. Inaddition, the number and dimension of each device shown in drawings areonly illustrative and are not intended to limit the scope of the presentdisclosure.

Certain terms are used throughout the description and following claimsto refer to particular components. As one skilled in the art willunderstand, electronic equipment manufacturers may refer to a componentby different names. This document does not intend to distinguish betweencomponents that differ in name but not function. In the followingdescription and in the claims, the terms “include”, “comprise” and“have” are used in an open-ended fashion, and thus should be interpretedto mean “include, but not limited to . . . ”.

It will be understood that when an element or layer is referred to asbeing “on” or “connected to” another element or layer, it can bedirectly on or directly connected to the other element or layer, orintervening elements or layers may be presented. In contrast, when anelement is referred to as being “directly on” or “directly connected to”another element or layer, there are no intervening elements or layerspresented.

The electrical connection may include direct connection or indirectconnection. The electrical connection between two components can beachieved by directly contacting in order to transmit electrical signals,and there are no other components between the two components. Theelectrical connection of two components can also be bridged through thecomponent intermediary between the two components to transmit electricalsignals. Electrical connection can also be called as coupling.

The term “about”, “substantially”, “equal”, or “same” generally refersto falling within 20% of a given value or range, or to falling within10%, 5%, 3%, 2%, 1%, or 0.5% of a given value or range.

Although terms such as first, second, third, etc., may be used todescribe diverse constituent elements, such constituent elements are notlimited by the terms. The terms are used only to discriminate aconstituent element from other constituent elements in thespecification. The claims may not use the same terms, but instead mayuse the terms first, second, third, etc. with respect to the order inwhich an element is claimed. Accordingly, in the following description,a first constituent element may be a second constituent element in aclaim.

It should be noted that the technical features in different embodimentsdescribed in the following can be replaced, recombined, or mixed withone another to constitute another embodiment without departing from thespirit of the present disclosure.

An electronic device of the present disclosure may include a displaydevice, an antenna device, or a tiled device, but not limited thereto.The electronic device may be a bendable or flexible electronic device.The electronic device may be a display device having a touch function,an image sensing function, various types of parameter sensing functions,or a fingerprint identification function. The display device may be aself-luminous display, such as organic light emitting diode (OLED)display, inorganic light emitting diode display (LED), mini lightemitting diode (mini LED, millimeter sized LED) display, micro lightemitting diode (micro-LED, micrometer sized LED) display, quantum dot(QD) material display (including, for example, quantum dot lightemitting diode (QLED, QDLED)), fluorescence material display, phosphormaterial display, or other suitable displays, or any combination of theabove displays, but not limited thereto. The concept or principle of thepresent disclosure can also be applied to a non-self-luminous liquidcrystal display (LCD), but not limited thereto. The embodiments of thepresent disclosure take an electronic device including a self-luminouslight emitting diode display as an example, but not limited thereto.

The antenna device may include, for example, a liquid crystal antenna orother types of antennas, but not limited thereto. The tiled device maybe, for example but not limited to, a display tiled device, an antennatiled device, or a combination thereof. It should be noted that theelectronic device can be any combination of the above devices, but notlimited thereto. In addition, the appearance of the electronic devicemay be rectangular, circular, polygonal, a shape with curved edges, orother suitable shapes. The electronic device may have peripheral systemssuch as a drive system, a control system, a light source system, a shelfsystem, etc. to support the display device, the antenna device, or thetiled device. Hereinafter, the display device is used as the electronicdevice to explain the present disclosure, but the present disclosure isnot limited thereto. If the electronic device is an antenna device orother devices, its minimum working unit can be equivalent to the pixelunit of the display device.

The sensors in the present disclosure can be applied to sensingapplications such as light, heat, pressure, electromagnetic force,vibration, sound, gravity, ultrasonic wave, length, image, touchcontrol, or fingerprint identification, and are not limited to specificfunctions. The embodiments of the present disclosure take fingerprintidentification sensing as an example, but not limited thereto.

A pixel unit in a display device may include a plurality of sub-pixelsdisposed side by side with each other. In one embodiment, the sub-pixelsin the display device may include green, red, and blue sub-pixels, orgreen, red, blue, and yellow sub-pixels, or green, red, blue, and whitesub-pixels, and these different colors of lights generated by thesub-pixels can be used to display color images, but not limited thereto.The color of light provided by the sub-pixels can be designed accordingto requirements. In another embodiment, the display device may be amonochrome display device, in which all sub-pixels may emit light of asingle color, such as white, red, or any suitable color. In addition,the shape of the sub-pixel in the top view may include rectangle,parallelogram, “>”-shape, or any suitable shape.

Referring to FIG. 1 and FIG. 2, FIG. 1 is a schematic diagramillustrating a display device according to a first embodiment of thepresent disclosure, and FIG. 2 is a circuit diagram of the displaydevice in FIG. 1. In order to make the drawings more simple and easy tounderstand, FIG. 1 only shows the structure of a pixel unit of thedisplay device 100, and omits thin film transistors, capacitors, scanlines, data lines, emission signal lines (power lines), reset signallines, read signal lines, or other related driving signal lines in thepixel circuitry and fingerprint sensor circuitry. In addition, FIG. 4 toFIG. 8 in the present disclosure also only show the structure of one ofthe pixel units in the display device 100 as an example. The displaydevice 100 of this embodiment may include a substrate 102 (shown in FIG.3), a plurality of pixel circuitries, a plurality of fingerprint sensorcircuitries, a plurality of light emitting units, and a plurality offingerprint sensor units. The pixel circuitries, the fingerprint sensorcircuitries, the light emitting units, and the fingerprint sensor unitsmay be disposed on the substrate 102. The light emitting units may bedisposed above the pixel circuitries (e.g., upward emitting type) or thelight emitting units may be disposed below the pixel circuitries (e.g.,downward emitting type), and the light emitting units may beelectrically connected to the pixel circuitries and driven by the pixelcircuitries. The fingerprint sensor units may be disposed above thefingerprint sensor circuitries or the fingerprint sensor units may bedisposed below the fingerprint sensor circuitries, and the fingerprintsensor units may be electrically connected to the fingerprint sensorcircuitries and driven by the fingerprint sensor circuitries. In thisembodiment, the material of the substrate 102 may include glass, quartz,sapphire, polymers (such as polyimide (PI), polyethylene terephthalate(PET)), and/or other suitable materials to be used as a flexiblesubstrate or a rigid substrate, but not limited thereto.

The technical features of this embodiment are described with one of thepixel units in the display device 100 hereinafter. As shown in FIG. 1,the display device 100 may include a first light emitting unit 1041, asecond light emitting unit 1043, and a third light emitting unit 1045.The first light emitting unit 1041, the second light emitting unit 1043,and the third light emitting unit 1045 may be disposed side by sidealong a first direction D1, and the third light emitting unit 1045 maybe disposed between the first light emitting unit 1041 and the secondlight emitting unit 1043, but not limited thereto. In this embodiment,the first light emitting unit 1041, the second light emitting unit 1043,and the third light emitting unit 1045 may emit different color lights.The first light emitting unit 1041 may emit blue light, the second lightemitting unit 1043 may emit red light, and the third light emitting unit1045 may emit green light, but not limited thereto. In this embodiment,the light emitting units may include organic light emitting diodes(OLED), but not limited thereto. In some embodiments, the light emittingunits may include OLED, LED, mini LED, micro-LED, quantum dot LED (QLED,QDLED), or any combination thereof, but not limited thereto. In someembodiments, the light emitting units may be different portions of theliquid crystal display used for emitting different color lights, but notlimited thereto. In some embodiments, the light emitting units may alsoemit other kinds of light in non-visible wavelength band, such asultraviolet light or infrared light.

In the first light emitting unit 1041, the second light emitting unit1043, and third light emitting unit 1045 in FIG. 1, the range orboundary of each of the light emitting units may be defined by the rangeor boundary of one of the electrodes of the OLED, but not limitedthereto. For example, the light emitting unit may be a diode. Generally,the diode may mainly include an anode (bottom electrode), a lightemitting layer, and a cathode (top electrode). The anode may usually beelectrically connected to a thin film transistor, the cathode may beelectrically connected to a common voltage source, and light can beemitted when current flows through the light emitting layer. The rangeor boundary of each of the light emitting unit may be defined by therange or boundary of the bottom electrode or anode of OLED, but notlimited thereto. In addition, the actual light emitting area of each ofthe light emitting units may be greater than, equal to, or less than thearea of the bottom electrode. The shape of the light emitting unit isnot limited to that shown in FIG. 1, and the light emitting unit mayhave different shapes according to requirements.

As shown in FIG. 1, the area of the first light emitting unit 1041 maybe greater than the area of the second light emitting unit 1043, and thearea of the second light emitting unit 1043 may be greater than the areaof the third light emitting unit 1045, but not limited thereto. Theareas of the light emitting units can be designed according to thelifetimes, luminous efficiencies, or hue requirements of light emittingmaterials used for emitting different color lights. For example, whenthe lifetime of the light emitting material used for emitting light witha certain color is short, the area of the light emitting unit used foremitting this light may be increased, whereas when the lifetime of thelight emitting material used for emitting light of a certain color islong, the area of the light emitting unit used for emitting this lightmay be reduced, but not limited thereto.

As shown in FIG. 1 and FIG. 2, the display device 100 may include afirst pixel circuitry 1061, a second pixel circuitry 1063, and a thirdpixel circuitry 1065. The first pixel circuitry 1061, the second pixelcircuitry 1063, and the third pixel circuitry 1065 may be disposed sideby side along the first direction D1, and the third pixel circuitry 1065may be disposed between the first pixel circuitry 1061 and the secondpixel circuitry 1063, but not limited thereto. The first light emittingunit 1041 may be disposed above (or below) the first pixel circuitry1061, and the first light emitting unit 1041 may be electricallyconnected to the first pixel circuitry 1061 and driven by the firstpixel circuitry 1061. The first light emitting unit 1041 may overlapwith the first pixel circuitry 1061 in a top view direction V, and aportion of the first light emitting unit 1041 may extend out of thefirst pixel circuitry 1061, but not limited thereto. The top viewdirection V may be, for example, a normal direction perpendicular to thesurface of the substrate 102. The second light emitting unit 1043 may bedisposed above (or below) the second pixel circuitry 1063, the secondlight emitting unit 1043 may be electrically connected to the secondpixel circuitry 1063 and driven by the second pixel circuitry 1063, andthe second light emitting unit 1043 may overlap with the second pixelcircuitry 1063 in the top view direction V. The third light emittingunit 1045 may be disposed above (or below) the third pixel circuitry1065, the third light emitting unit 1045 may be electrically connectedto the third pixel circuitry 1065 and driven by the third pixelcircuitry 1065, and the third light emitting unit 1045 may overlap withthe third pixel circuitry 1065 in the top view direction V. In thisembodiment, the area of the first pixel circuitry 1061, the area of thesecond pixel circuitry 1063, and the area of the third pixel circuitry1065 may be approximately equal, but not limited thereto. In addition,the shape of the pixel circuitry is not limited to that shown in FIG. 1,and the pixel circuitry may have different shapes according torequirements.

In addition, the display device 100 may include a plurality of scanlines, a plurality of data lines, and a plurality of emission signallines disposed on the substrate 102. As shown in FIG. 1 and FIG. 2, thescan lines (such as the scan line 1121 and the scan line 1123) mayextend along the first direction D1, the data lines 114 and the emissionsignal lines 116 (shown in FIG. 2) may extend along a second directionD2, and the data lines 114 and the emission signal lines 116 may crossthe scan line 1121 and the scan line 1123, but not limited thereto. Inother embodiments, the data lines 114, the emission signal lines 116,and the scan lines 1121, 1123 may not necessarily be straight lines, butthey may still substantially extend in a direction. In otherembodiments, the scan lines 1121, 1123 may extend in differentdirections, the data lines 114 or the emission signal lines 116 may alsoextend in other directions different from the second direction D2, andthe data lines 114 or the emission signal lines 116 may be partially orcompletely parallel to the scan lines 1121, 1123.

The first pixel circuitry 1061, the second pixel circuitry 1063, and thethird pixel circuitry 1065 in FIG. 1 and FIG. 2 may all be electricallyconnected to the scan line 1121 and respectively electrically connectedto one of the data lines 114 and one of the emission signal lines 116.In addition, the scan line 1123 may be electrically connected to thefirst pixel circuitry 1061, the second pixel circuitry 1063, and thethird pixel circuitry 1065 in another row. Taking FIG. 2 as an example,each of the pixel circuitries may include two thin film transistorselectrically connected to each other, the gate of the thin filmtransistor T11 may be electrically connected to the scan line 1121, thefirst terminal of the thin film transistor T11 may be electricallyconnected to one of the data lines 114, and the second terminal of thethin film transistor T11 may be electrically connected to the gate ofanother thin film transistor T12, but not limited thereto. The firstterminal of the thin film transistor T12 may be electrically connectedto the emission signal line 116, the second terminal of the thin filmtransistor T12 may be electrically connected to the corresponding lightemitting unit, and the emission signal line 116 may provide a voltage tothe thin film transistor T12, but not limited thereto. In addition, thefirst terminal and the second terminal of the thin film transistordescribed herein may be, for example, source and drain, or drain andsource.

Referring to FIG. 2, the pixel circuitry in this disclosure may include,for example, the thin film transistors electrically connected to thecorresponding light emitting unit and/or the thin film transistors usedfor driving the corresponding light emitting unit, and the area andboundary of the pixel circuitry may be the area and boundary occupied bythese elements. The pixel circuitry may not include the data lines 114,scan lines 1121, 1123, emission signal lines 116, or other signal linesused for transmitting signals. Specifically, the pixel circuitry mayinclude a portion of signal lines used for forming the structure of thethin film transistor. For example, a portion of the scan line formingthe gate of the thin film transistor, a portion of the data line, or aportion of the emission signal line. In addition, the number orconnection relationship of the thin film transistors in the pixelcircuitry of the present disclosure is not limited to the abovedescription. Each of the pixel circuitries may include, for example,more than two thin film transistors, such as three, four, six, seven, orother numbers of thin film transistors. The definition of fingerprintsensor circuitry is basically similar to that of the pixel circuitry.The difference is that the fingerprint sensor circuitry is electricallyconnected to the fingerprint sensor unit and drives the fingerprintsensor unit, and the connection of thin film transistors in thefingerprint sensor circuitry and the number of thin film transistors inthe fingerprint sensor circuitry may be different from those of thinfilm transistors in the pixel circuitry. Moreover, in some embodiments,the pixel circuitry 1061/1063/1065 and the fingerprint sensor circuitry110 are electrically connected to the same scan line 1121, but notlimited thereto.

Referring to FIG. 1, the display device 100 may include a fingerprintsensor unit 108 and a fingerprint sensor circuitry 110. The fingerprintsensor unit 108 may be disposed above the fingerprint sensor circuitry110 (e.g., top side sensing) or the fingerprint sensor unit 108 may bedisposed below the fingerprint sensor circuitry 110 (e.g., bottom sidesensing), the fingerprint sensor unit 108 may be electrically connectedto the fingerprint sensor circuitry 110 and driven by the fingerprintsensor circuitry 110, and the fingerprint sensor unit 108 may overlapwith the fingerprint sensor circuitry 110 in the top view direction V.The fingerprint sensor unit 108 of this embodiment may include aphotodiode (such as a PIN diode or other suitable photoelectricconversion elements) used for detecting the intensity of light reflectedby the finger to perform fingerprint identification, but not limitedthereto. In other embodiments, the fingerprint sensor unit 108 mayinclude a capacitor or a piezoelectric element. In some embodiments, thefingerprint sensor unit 108 may be capacitors or pressure sensingelements, the fingerprint sensor unit 108 may not be used forfingerprint sensing, the fingerprint sensor unit 108 may be used fortouch sensing, pressure sensing, etc. for example. In addition, theshapes of the fingerprint sensor unit 108 and the fingerprint sensorcircuitry 110 are not limited to those shown in FIG. 1, and may havedifferent shapes according to requirements.

As shown in FIG. 1, in the second direction D2, the fingerprint sensorcircuitry 110 may be disposed on one side of the first pixel circuitry1061, the second pixel circuitry 1063, and the third pixel circuitry1065, and the fingerprint sensor unit 108 may be disposed on one side ofthe second light emitting unit 1043 and the third light emitting unit1045, but not limited thereto. For example, the second direction D2 maybe perpendicular to the first direction D1, but not limited thereto. Inthis embodiment, the first light emitting unit 1041 may extend to thetop of the fingerprint sensor circuitry 110 along the second directionD2, and the first light emitting unit 1041 may overlap with at least aportion of the fingerprint sensor circuitry 110 in the top viewdirection V, but not limited thereto. In addition, the second lightemitting unit 1043 and the third light emitting unit 1045 do not extendto the top of the fingerprint sensor circuitry 110, but not limitedthereto. In some embodiments, the third light emitting unit 1045 mayextend to the top of the fingerprint sensor circuitry 110 in the seconddirection D2, and the third light emitting unit 1045 may overlap atleast a portion of the fingerprint sensor circuitry 110 in the top viewdirection V Further, the first light emitting unit 1041 and the secondlight emitting unit 1043 do not extend to the top of the fingerprintsensor circuitry 110, and the fingerprint sensor unit 108 may bedisposed on one side of the first light emitting unit 1041 and thesecond light emitting unit 1043, but not limited thereto.

In addition, the ratios of areas between the fingerprint sensor unit andthe light emitting units can be adjusted according to requirements ofthe display effect or fingerprint sensitivity. For example, in thisembodiment, the ratio of the area of the fingerprint sensor unit 108 tothe area of the first light emitting unit 1041 may be 0.1 to 2 (greaterthan or equal to 0.1 and less than or equal to 2), or may be 0.1 to 1(greater than or equal to 0.1 and less than or equal to 1). The range orboundary of the fingerprint sensor unit 108 may be defined by the rangeor boundary of one of the electrodes (such as the bottom electrode) ofthe photodiode, but not limited thereto. The display device 100 may havehigh density of fingerprint sensor units 108 and may provide highsensitivity of fingerprint sensing while maintaining high resolution ofthe display image when the ratio is in the above range. In addition, theratio of the area of the fingerprint sensor unit 108 to the area of thesecond light emitting unit 1043, or the ratio of the area of thefingerprint sensor unit 108 to the area of the third light emitting unit1045 may also be in the above range, but not limited thereto.

In the pixel unit in FIG. 1, the fingerprint sensor circuitry 110 may beelectrically connected to two adjacent scan lines 1121, 1123 through aconductive line 1111 and a conductive line 1113. Taking FIG. 2 as anexample, the fingerprint sensor circuitry 110 may include at least twothin film transistors electrically connected to each other. The gate ofthe thin film transistor T21 may be electrically connected to the scanline 1121, the first terminal of the thin film transistor T21 may beelectrically connected to a reset signal line 118, and the secondterminal of the thin film transistor T21 may be electrically connectedto the fingerprint sensor unit 108, but not limited thereto. The gate ofthe thin film transistor T22 may be electrically connected to the scanline 1123, the first terminal of the thin film transistor T21 may beelectrically connected to the fingerprint sensor unit 108, and thesecond terminal of the thin film transistor T21 may be electricallyconnected to the read signal line 120, but not limited thereto. Thus,the integrated circuit chip in the display device 100 may detect thechange of current generated by the fingerprint sensor unit 108 throughthe read signal line 120, and the fingerprint sensor unit 108 may returnto the initial state through the reset signal line 118 before eachoperation.

In some variant embodiments of the first embodiment, the thin filmtransistor T21 of the fingerprint sensor circuitry 110 may not beelectrically connected to the scan line 1121. For example, the displaydevice 100 may include a plurality of control signal lines extendingparallel to the scan lines 1121, 1123, and one of the control signallines may be disposed between the scan line 1121 and the scan line 1123.The thin film transistor T21 may be electrically connected to thecontrol signal line, and the thin film transistor T22 may still beelectrically connected to the scan line 1123, but not limited thereto.

Similar to the definition of the pixel circuitry, the fingerprint sensorcircuitry 110 may include, for example, at least one thin filmtransistor electrically connected to the corresponding fingerprintsensor unit 108 and/or used for driving the corresponding fingerprintsensor unit 108, and the area and boundary of the fingerprint sensorcircuitry 110 may be the area and boundary occupied by these elements.The fingerprint sensor circuitry 110 may not include the data line 114,scan lines 1121, 1123, emission signal line 116, reset signal line 118,read signal line 120, or other signal lines used for transmittingsignals. Specifically, the fingerprint sensor circuitry 110 may includea portion of signal lines used for forming the structure of thin filmtransistors, such as a portion of the scan line used for forming thegate of the thin film transistor. In addition, the number of the thinfilm transistors in the fingerprint sensor circuitry 110 of the presentdisclosure or the connection relationship of the thin film transistorsin the fingerprint sensor circuitry 110 of the present disclosure is notlimited to the above description. Each of the fingerprint sensorcircuitries 110 may include, for example, more than two thin filmtransistors, such as three, four, six, seven, or other numbers of thinfilm transistors.

The operation of the fingerprint sensing of the display device 100 ofthis embodiment can be described by the following examples, but notlimited thereto. For example, the display device 100 may include thedisplay function, touch sensing function, and fingerprint sensingfunction. The display device 100 can determine the touch position whenthe user's finger touches the display device 100 and when the displaydevice 100 displays images or does not display images. The displaydevice 100 can drive pixels disposed near the touch position to emitgreen light (which can also be other color light with high sensitivityto sensors), and drive the fingerprint sensor disposed near the touchposition to detect fingerprints.

As described above, in the display device 100 of this embodiment, eachof the pixel units includes the fingerprint sensor unit 108 and thefingerprint sensor circuitry 110 used for driving the fingerprint sensorunit 108 in addition to the red sub-pixel, blue sub-pixel, greensub-pixel, and the pixel circuitry used for driving the abovesub-pixels. The fingerprint sensor can be integrated into the displayregion of the display device 100, and the display region can be furtherexpanded to make the edge of the display region closer to the edge ofthe display device 100, thereby achieving the advantage of enlarging thescreen proportion or narrowing the frame. In addition, the fingerprintsensor circuitry 110 and the pixel circuitries of this embodiment canelectrically connected to the scan lines 1121, 1123 without additionallydisposing signal lines for transmitting signals to the fingerprintsensor circuitry 110, which can reduce the number of conductive lines inthe display device 100 and save space. The cross-sectional structure ofthe display device 100 of this embodiment will be described below.

Referring to FIG. 3, it is a cross-sectional schematic diagramillustrating a structure taken along the line A-A′ of FIG. 1. In orderto make the drawing more simplified and easy to understand, FIG. 3 onlyshows one of the thin film transistors in the first pixel circuitry 1061and one of the thin film transistors in the fingerprint sensor circuitry110 as an example. The numbers of thin film transistors in the firstpixel circuitry 1061 and the fingerprint sensor circuitry 110 are notlimited to that shown in FIG. 3. In the top view direction V, the thinfilm transistor T1 of the first pixel circuitry 1061 may be disposedbetween the first light emitting unit 1041 and the substrate 102, andthe thin film transistor T2 of the fingerprint sensor circuitry 110 maybe disposed between the fingerprint sensor unit 108 and the substrate102, but not limited thereto. The thin film transistor T1 and the thinfilm transistor T2 may be disposed on a buffer layer 122, and the thinfilm transistor T1 and the thin film transistor T2 (or the first pixelcircuitry 1061 and the fingerprint sensor circuitry 110) of thisembodiment may be disposed on the same plane, but not limited thereto.In an embodiment, the thin film transistor T1 and the thin filmtransistor T2 both directly disposed on a top surface of the bufferlayer 122. In another embodiment, the buffer layer 122 may be disposedbetween the thin film transistors T1, T2 and the substrate 102. Inaddition, the display device 100 may further include a light shieldinglayer 124 disposed between the thin film transistor T1 and the substrate102, and the light shielding layer 124 may be disposed under the bufferlayer 122.

The thin film transistors T1, T2 respectively may include a gate GE, asource SE, a drain DE, and a semiconductor layer SC. The semiconductorlayer SC may be disposed on the buffer layer 122, and two doped regionsof the semiconductor layer SC respectively may be located at two ends ofthe semiconductor layer SC, and the doped regions respectively may beused for electrically connecting the source SE and the drain DE. Thegate GE may be disposed on the semiconductor layer SC, and a gateinsulating layer GI may be disposed between the gate GE and thesemiconductor layer SC. An interlayer dielectric layer ILD may cover thegate GE, and the source SE and the drain DE may be disposed on theinterlayer dielectric layer ILD. In addition, an insulating layer BP maycover the source SE and the drain DE, and a planarization layer PLN maybe disposed on the insulating layer BP. The laminated structures of theabove-mentioned thin film transistors T1, T2 may be top gate thin filmtransistors for example, the thin film transistors T1, T2 may also bebottom gate thin film transistors according to the requirements, or thematerial of the semiconductor layer may also be adjusted according tothe requirements.

The first light emitting unit 1041 may be disposed on the planarizationlayer PLN. The first light emitting unit 1041 of this embodiment may bean OLED for example. The first light emitting unit 1041 may include alower electrode BE1, a light emitting material layer EL, and an upperelectrode TE1, but not limited thereto. The bottom electrode BE1 may bedisposed on the planarization layer PLN and electrically connected tothe drain DE of the thin film transistor T1. The bottom electrode BE1may be, for example, an anode of the first light emitting unit 1041, butnot limited thereto. The light emitting material layer EL may bedisposed on the bottom electrode BE1 and in an opening of a pixeldefining layer PDL. The light emitting material layer EL may include theorganic light emitting material, but not limited thereto. The topelectrode TE1 may be disposed on the light emitting material layer ELand the pixel definition layer PDL, and the top electrode TE1 may be,for example, a common cathode electrically connected to a common voltagesignal source, but not limited thereto.

The fingerprint sensor unit 108 may be disposed on the planarizationlayer PLN and covered by the pixel definition layer PDL. Therefore, thefirst light emitting unit 1041 and the fingerprint sensor unit 108 maybe disposed on the same plane, but not limited thereto. The fingerprintsensor unit 108 may also be disposed on the insulating layer BP. Thefingerprint sensor unit 108 of this embodiment may include a PIN diode(or may be an inorganic or organic diode), but not limited thereto. ThePIN diode may include a first semiconductor layer SM1, a secondsemiconductor layer SM2, and a third semiconductor layer SM3. The thirdsemiconductor layer SM3 may be disposed on the first semiconductor layerSM1, and the second semiconductor layer SM2 may be disposed between thefirst semiconductor layer SM1 and the third semiconductor layer SM3. Thefirst semiconductor layer SM1 may be N-type semiconductor layer, thesecond semiconductor layer SM2 may be an intrinsic layer, and the thirdsemiconductor layer SM3 may be P-type semiconductor layer, but notlimited thereto. In some embodiments, the first semiconductor layer SM1may be P-type semiconductor layer, and the third semiconductor layer SM3may be N-type semiconductor layer. In addition, the fingerprint sensorunit 108 may further include a top electrode TE2 and a bottom electrodeBE2 disposed on the upper and lower sides of the PIN diode. The bottomelectrode BE2 may be disposed between the planarization layer PLN andthe first semiconductor layer SM1, and the bottom electrode BE2 may beelectrically connected to the drain DE of the thin film transistor T2.The top electrode TE2 may be disposed between the third semiconductorlayer SM3 and the pixel defining layer PDL, and the top electrode TE2may be electrically connected to a signal line TE3. In addition, aninorganic insulating layer IN1 may be disposed on the top electrode TE1,an inorganic insulating layer IN2 may be disposed on the inorganicinsulating layer IN1, and an organic insulating layer IN3 may bedisposed between the inorganic insulating layer IN1 and the inorganicinsulating layer IN2, but not limited thereto.

For example, the materials of the gate GE, the source SE, the drain DE,and/or the bottom electrodes BE1, BE2 may include metals (e.g., silver(Ag), copper (Cu), or aluminum (Al)), metal oxides, other suitableconductive materials, or combinations thereof, but not limited thereto.The materials of the top electrodes TE1, TE2 may include transparentconductive materials (e.g., indium tin oxide (ITO), indium zinc oxide(IZO), etc.), metals (e.g., silver (Ag)), other suitable conductivematerials, or combinations thereof, but not limited thereto. Thematerials of the buffer layer 122, the gate insulating layer GI, theinterlayer dielectric layer ILD, the insulating layer BP, theplanarization layer PLN, and/or the pixel defining layer PDL may includesilicon oxide, silicon nitride, silicon oxynitride, other suitableinsulating materials, or combinations thereof, but not limited thereto.The material of the semiconductor layer SC may include polycrystallinesilicon, amorphous silicon, metal oxide semiconductor (IGZO), othersuitable semiconductor materials, or combinations thereof, but notlimited thereto. The material of the light shielding layer 124 mayinclude metal or metal oxide, but not limited thereto.

The display device of the present disclosure is not limited by theaforementioned embodiment, and may have other different embodiments andvariant embodiments. To simplify the description, similar components ineach of the following embodiments are marked with similar symbols. Formaking it easier to compare the difference between the embodiments, thefollowing description will detail the dissimilarities among differentembodiments and the similar features will not be redundantly described.

Referring to FIG. 4, it is a schematic diagram illustrating a displaydevice according to a second embodiment of the present disclosure.Different from the first embodiment, the second light emitting unit 1043of this embodiment may also extend to the top of the fingerprint sensorcircuitry 110 along the second direction D2, and the second lightemitting unit 1043 may overlap with at least another portion of thefingerprint sensor circuitry 110 in the top view direction V, but notlimited thereto. In this embodiment, the first light emitting unit 1041and the second light emitting unit 1043 can be extended to the top ofthe fingerprint sensor circuitry 110 by reducing the area of thefingerprint sensor unit 108, but not limited thereto. Additionally, thethird light emitting unit 1045 of this embodiment may not extend to thetop of the fingerprint sensor circuitry 110, but not limited thereto. Inthis embodiment, the first light emitting unit 1041 may emit blue light,the second light emitting unit 1043 may emit red light, and the thirdlight emitting unit 1045 may emit green light, but not limited thereto.In addition, the overlapping area of the second light emitting unit 1043and the fingerprint sensor circuitry 110 may be less than theoverlapping area of the first light emitting unit 1045 and thefingerprint sensor circuitry 110, but not limited thereto. However, insome embodiments, the first light emitting unit 1041 may emit bluelight, the second light emitting unit 1043 may emit green light, and thethird light emitting unit 1045 may emit red light, or in someembodiments, the first light emitting unit 1041 may emit green light,but not limited thereto.

Referring to FIG. 5, it is a schematic diagram illustrating a displaydevice according to a third embodiment of the present disclosure.Different from the first embodiment, the area of the first pixelcircuitry 1061 may be reduced, the area of the fingerprint sensorcircuitry 110 may be increased, and the area of the first pixelcircuitry 1061 may be less than the area of the second pixel circuitry1063 and/or the area of the third pixel circuitry 1065 in thisembodiment. The area of the pixel circuitry or the area the fingerprintsensor circuitry 110 may be adjusted by adjusting the number of thinfilm transistors included therein or the sizes (e.g., areas) of the thinfilm transistors. For example, the first pixel circuitry 1061 mayinclude three to four thin film transistors, and the second pixelcircuitry 1063 and the third pixel circuitry 1065 may include six toseven thin film transistors, but not limited thereto. For example, thesecond pixel circuitry 1063 and the third pixel circuitry 1065 mayinclude compensation circuits, and the first pixel circuitry 1061 maynot include the compensation circuit and require an externalcompensation circuit, but not limited thereto. Alternatively, the firstpixel circuitry 1061, the second pixel circuitry 1063, and the thirdpixel circuitry 1065 may include the same number of thin filmtransistors, but the sizes of the thin film transistors in the firstpixel circuitry 1061 may be less than the sizes of the thin filmtransistors in the second pixel circuitry 1063 and the third pixelcircuitry 1065. In addition, the above method of adjusting the size ofthe circuitry can also be applied to the fingerprint sensor circuitry110 or other embodiments.

In some variant embodiments of the third embodiment, the differencebetween these variant embodiments and the third embodiment is that thearea of the second light emitting unit 1043 and/or the area of the thirdlight emitting unit 1045 may be reduced and the area of the fingerprintsensor unit 108 may be increased, a portion of the fingerprint sensorunit 108 may extend to the top of the second pixel circuitry 1063 andthe third pixel circuitry 1065 along the second direction D2, and theportion of the fingerprint sensor unit 108 may partially overlap withthe second pixel circuitry 1063 and the third pixel circuitry 1065, butnot limited thereto.

Referring to FIG. 6, it is a schematic diagram illustrating a displaydevice according to a fourth embodiment of the present disclosure.Different from the first embodiment, the area of the first pixelcircuitry 1061 may be less than the area of the second pixel circuitry1063 and the area of the third pixel circuitry 1065, and the area of thefingerprint sensor circuitry 110 may be less than the area of the firstpixel circuitry 1061 in this embodiment, but not limited thereto. Forexample, the first pixel circuitry 1061 and the fingerprint sensorcircuitry 110 may be disposed on one side of the third pixel circuitry1065 in the first direction D1, and the fingerprint sensor circuitry 110may be disposed on one side of the first pixel circuitry 1061 in thesecond direction D2, but not limited thereto. In addition, thefingerprint sensor unit 108 may partially overlap with at least one ofthe first pixel circuitry 1061, the second pixel circuitry 1063, and thethird pixel circuitry 1065. Taking FIG. 6 as an example, the fingerprintsensor unit 108 may partially overlap with the first pixel circuitry1061, the second pixel circuitry 1063, and the third pixel circuitry1065, but not limited thereto.

In some embodiments, the difference between these embodiments and thefourth embodiment is that the area of the second pixel circuitry 1063and the area of the third pixel circuitry 1065 may be less than the areaof the first pixel circuitry 1061, but not limited thereto. For example,the second pixel circuitry 1063, the third pixel circuitry 1065, and thefingerprint sensor circuitry 110 may be disposed on one side of thefirst pixel circuitry 1061 in the first direction D1, and thefingerprint sensor circuitry 110 may be disposed on one side of thesecond pixel circuitry 1063 and the third pixel circuitry 1065 in thesecond direction D2, but not limited thereto.

Referring to FIG. 7, it is a schematic diagram illustrating a displaydevice according to a fifth embodiment of the present disclosure.Different from the first embodiment, the first pixel circuitry 1061, thesecond pixel circuitry 1063, the third pixel circuitry 1065, and thefingerprint sensor circuitry 110 of this embodiment may be disposed sideby side along the first direction D1, and the first pixel circuitry 1061may be disposed between the third pixel circuitry 1065 and thefingerprint sensor circuitry 110, but not limited thereto. In addition,the fingerprint sensor unit 108 may extend from the fingerprint sensorcircuitry 110 to the second pixel circuitry 1063 and cross the firstpixel circuitry 1061 and the third pixel circuitry 1065, but not limitedthereto.

Referring to FIG. 8 and FIG. 9, FIG. 8 is a schematic diagramillustrating a display device according to a sixth embodiment of thepresent disclosure, and FIG. 9 is a cross-sectional schematic diagramillustrating a structure taken along the line B-B′ of FIG. 8. In orderto make the drawings more simple and easy to understand, FIG. 9 onlyillustrates three thin film transistors T1 a, T1 b, and T1 c in thefirst pixel circuitry 1061 and one of the thin film transistors (thethin film transistor T2) in the fingerprint sensor circuitry 110 as anexample. The numbers of thin film transistors in the first pixelcircuitry 1061 and the fingerprint sensor circuitry 110 are not limitedto that shown in FIG. 9. As shown in FIG. 8, the difference between thisembodiment and the first embodiment is that the fingerprint sensorcircuitry 110 of this embodiment may overlap with a portion of the firstpixel circuitry 1061 in the top view direction V. Taking FIG. 9 as anexample, the thin film transistor T2 of the fingerprint sensor circuitry110 may be disposed between the fingerprint sensor unit 108 and the thinfilm transistor T1 c of the first pixel circuitry 1061 in the top viewdirection V. The thin film transistor T2 (or the fingerprint sensorcircuitry 110) and the thin film transistors T1 a, T1 b, and T1 c (orthe first pixel circuitry 1061) may be disposed on different planes inthis embodiment. For example, the thin film transistors T1 a, T1 b, andT1 c may be disposed on the buffer layer 122, and the thin filmtransistor T2 may be disposed on the insulating layer BP, but notlimited thereto. Since the thin film transistor T2 and the thin filmtransistors T1 a, T1 b, and T1 c may be disposed on different planes,the display device 100 of this embodiment may further include a gateinsulating layer GI2 and an insulating layer BP2, the gate insulatinglayer GI2 may be disposed between the gate GE and the semiconductorlayer SC of the thin film transistor T2, and the insulating layer BP2may be disposed between the gate insulating layer GI2 and theplanarization layer PLN and cover the source SE and the drain DE of thethin film transistor T2, but not limited thereto. In this embodiment,the thin film transistors T1 a, T1 b, and T1 c may be top-gate type thinfilm transistors and the thin film transistor T2 may be a bottom-gatetype thin film transistor, but not limited thereto.

Referring to FIG. 10, it is a schematic diagram illustrating a displaydevice according to a seventh embodiment of the present disclosure.Different from the first embodiment, the display device 100 of thisembodiment may include a plurality of sub-pixel columns SPC1 and aplurality of sub-pixel columns SPC2, and the sub-pixel columns SPC1 andthe sub-pixel columns SPC2 may be alternately disposed in the firstdirection D1, but not limited thereto. Each of the sub-pixel columnsSPC1 may include a plurality of first light emitting units 1041, aplurality of first pixel circuitries 1061, a plurality of second lightemitting units 1043, a plurality of second pixel circuitries 1063, aplurality of fingerprint sensor units 108, and a plurality offingerprint sensor circuitries 110. In the second direction D2, thefirst light emitting units 1041 and the second light emitting units 1043may be alternately disposed, and one of the fingerprint sensor units 108may be disposed between one of the first light emitting units 1041 andone of the second light emitting units 1043, but not limited thereto. Inthe first direction D1, the first light emitting units 1041 and thesecond light emitting units 1043 in the same row may be alternatelydisposed also. In addition, in the second direction D2, the first pixelcircuitries 1061 and the second pixel circuitries 1063 may bealternately disposed, and one of the fingerprint sensor circuitries 110may be disposed between one of the first pixel circuitries 1061 and oneof the second pixel circuitries 1063, but not limited thereto. Each ofthe first light emitting units 1041 and each of the second lightemitting units 1043 respectively may overlap with at least a portion ofone of the fingerprint sensor circuitries 110 in the top view directionV, and each of the fingerprint sensor units 108 may overlap with atleast a portion of one of the first pixel circuitries 1061 or one of thesecond pixel circuitries 1063 in the top view direction V, but notlimited thereto.

Each of the sub-pixel columns SPC2 may include a plurality of thirdlight emitting units 1045 and a plurality of third pixel circuitries1065 disposed along the second direction D2. In the first direction D1,one of the third light emitting units 1045 may be disposed between twoof the fingerprint sensor units 108, and each of the third pixelcircuitries 1065 may be disposed between one of the first pixelcircuitries 1061 and one of the second pixel circuitries 1063 andbetween two of the fingerprint sensor circuitries 110, but not limitedthereto. The area of one of the third pixel circuitries 1065 may begreater than the area of one of the first pixel circuitries 1061 and/orthe area of one of the second pixel circuitries 1063, but not limitedthereto. In this embodiment, the shapes of the third light emittingunits 1045 and the fingerprint sensor units 108 may be rectangular (andthe edges may have rounded corners), and the shapes of the first lightemitting units 1041 and the second light emitting units 1043 may berhombus (and the edges may have rounded corners), but not limitedthereto.

Referring to FIG. 11, it is a schematic diagram illustrating a displaydevice according to an eighth embodiment of the present disclosure.Different from the seventh embodiment, the plurality of fingerprintsensor units 108 and the plurality of fingerprint sensor circuitries 110of this embodiment may be disposed in the sub-pixel columns SPC2. One ofthe fingerprint sensor units 108 may be disposed between two of thethird light emitting units 1045 adjacent to each other (“adjacent” isdefined as that no other third light emitting unit exists on theshortest connection line between two third light emitting units) in thesecond direction D2, and the fingerprint sensor unit 108 may be disposedbetween one of the first light emitting units 1041 and one of the secondlight emitting units 1043 in the first direction D1, but not limitedthereto. One of the fingerprint sensor circuitries 110 may be disposedbetween two of the third pixel circuitries 1065 adjacent to each otherin the second direction D2, and the fingerprint sensor circuitry 110 maybe disposed between one of the first pixel circuitries 1061 and one ofthe second pixel circuitries 1063 in the first direction D1, but notlimited thereto. Therefore, the area of one of the third pixelcircuitries 1065 may be less than the area of one of the first pixelcircuitries 1061 and/or the area of one of the second pixel circuitries1063 in this embodiment, but not limited thereto. In addition, one ofthe third light emitting units 1045 may overlap with at least a portionof one of the fingerprint sensor circuitries 110 in the top viewdirection V, and one of the fingerprint sensor units 108 may overlapwith at least a portion of one of the third pixel circuitries 1065 inthe top view direction V, but not limited thereto.

In this embodiment, the shape of the fingerprint sensor unit 108 may bea “X” shape (and the edges may have rounded corners), but not limitedthereto. In some variant embodiments of the eighth embodiment, the shapeof the fingerprint sensor unit 108 may be a frame shape, and each of thefingerprint sensor units 108 may surround one of the third lightemitting units 1045. In addition, each of the fingerprint sensor units108 may be disposed between one of the third light emitting units 1045and one of the first light emitting units 1041 adjacent thereto, andbetween the third light emitting unit 1045 and one of the second lightemitting units 1043 adjacent thereto, but not limited thereto. In somevariant embodiments of the eighth embodiment, the shape of thefingerprint sensor unit 108 may be the frame shape with rounded corners,but not limited thereto.

Referring to FIG. 12, it is a schematic diagram illustrating a displaydevice according to a ninth embodiment of the present disclosure.Different from the seventh embodiment, the fingerprint sensor units 108and the fingerprint sensor circuitries 110 of this embodiment may bedisposed in the sub-pixel columns SPC2, and the fingerprint sensor units108 may replace some of the third light emitting units 1045 in theseventh embodiment. For example, one of the fingerprint sensor units 108may be disposed between two of the first light emitting units 1041adjacent to each other, two of the second light emitting units 1043adjacent to each other, and two of the third light emitting units 1045adjacent to each other. In addition, in the second direction D2, one ofthe fingerprint sensor units 108 may be disposed between a group S11 ofone of the first light emitting units 1041, one of the second lightemitting units 1043, and one of the third light emitting units 1045 andanother group S12 of one of the first light emitting units 1041, one ofthe second light emitting units 1043, and one of the third lightemitting units 1045. Another difference between this embodiment and theseventh embodiment is that the density of the fingerprint sensor units108 of this embodiment may be smaller, and the area of the fingerprintsensor unit 108 may be larger, but not limited thereto. In addition,since the fingerprint sensor circuitries 110 of this embodiment may bedisposed in the sub-pixel columns SPC2 with the fingerprint sensor units108, the areas of some of the third pixel circuitries 1065 may be lessthan the area of the first pixel circuitry 1061 and/or the area of thesecond pixel circuitry 1063, but not limited thereto.

To sum up, the display device of the present disclosure integrates thefingerprint sensor units and the fingerprint sensor circuitries into thedisplay region by integrating a plurality of fingerprint sensor unitsand a plurality of fingerprint sensor circuitries into a plurality ofpixel units, and therefore the sub-pixels emitting different colors andthe fingerprint sensor can be included in one of the pixel units. Underthis design, the display device can include the fingerprint sensor unitswith high density and can provide the fingerprint sensing functionhaving high sensitivity while maintaining the high resolution of thedisplay image. In addition, under this design, the light emitting unitof at least one of the sub-pixels may overlap with at least a portion ofthe fingerprint sensor circuitry in the top view direction in one pixelunit.

The above description refers to embodiments of the present disclosure,and it is not intended to limit the present disclosure. For thoseskilled in the art, the present disclosure can be modified or adjusted.As long as the different features between the embodiments do notconflict or depart from the spirit of the present disclosure, they canbe rearranged or combined arbitrarily according to the designs. Anymodification, equivalent substitution, improvement, etc. made within thespirit or principles of the present disclosure shall be included withinthe scope of the present disclosure.

What is claimed is:
 1. A display device, comprising: a substrate; apixel circuitry disposed on the substrate; a first light emitting unitdisposed on the substrate and driven by the pixel circuitry; afingerprint sensor circuitry disposed on the substrate; and afingerprint sensor unit disposed on the substrate and driven by thefingerprint sensor circuitry, wherein the first light emitting unitoverlaps with a least a portion of the fingerprint sensor circuitry in atop view direction of the display device.
 2. The display deviceaccording to claim 1, wherein the first light emitting unit emits a bluelight.
 3. The display device according to claim 1, wherein a ratio of anarea of the fingerprint sensor unit to an area of the first lightemitting unit is greater than or equal to 0.1 and less than or equal to2.
 4. The display device according to claim 1, further comprising asecond light emitting unit disposed on the substrate, wherein the secondlight emitting unit overlaps with at least another portion of thefingerprint sensor circuitry in the top view direction of the displaydevice.
 5. The display device according to claim 4, wherein the firstlight emitting unit and the second light emitting unit emit differentcolor lights.
 6. The display device according to claim 5, wherein thefirst light emitting unit emits a blue light, and the second lightemitting unit emits a red light.
 7. The display device according toclaim 5, wherein the first light emitting unit emits a blue light, andthe second light emitting unit emits a green light.
 8. The displaydevice according to claim 5, wherein the first light emitting unit emitsa green light.